Cambridge IGCSE Guide: Subjects, Grading, and How It Works

By Grace O., Science Teacher

The direct answer: Cambridge IGCSE is an international qualification from Cambridge Assessment International Education, usually taken over two years at ages 14 to 16. It offers a wide range of subjects and is graded A* to G, while the separate Pearson Edexcel International GCSE uses a 9 to 1 scale. This guide explains the subjects, the grading, the exam sessions, and a study plan that fits the format.

Cambridge IGCSE at a Glance

What Cambridge IGCSE Offers

Cambridge IGCSE covers a broad set of subjects across groups such as English language and literature, mathematics, sciences, languages, humanities, and creative subjects. The programme is typically taken by students in Grades 9 and 10 (ages 14 to 16) and offers over 70 subjects (Cambridge IGCSE subjects). Examples include:

• English: First Language and Second Language English.
• Mathematics: a core maths course plus additional and international mathematics options.
• Sciences: Biology (code 0610), Chemistry (0620), Physics (0625), and combined or coordinated science routes.
• Languages: more than 30 language subjects, from Spanish and French to Mandarin and Arabic.
• Humanities and social sciences: history, geography, business, and economics.
• Creative and professional: art and design, music, and computer science.

Schools usually require English, mathematics, at least one science, and often one humanity, then let you choose the rest. The wide choice lets you build a profile that keeps several post 16 routes open.

Grading and Tiers

Cambridge IGCSE grades run from A* (highest) down to G, with U for ungraded. A grade C is widely treated as a standard pass. The separate Pearson Edexcel International GCSE uses the 9 to 1 scale, where 9 is the top grade and 4 is a standard pass (IGCSE assessment overview).

Many Cambridge subjects offer two tiers. The Core curriculum targets grades C to G and covers essential content. The Extended curriculum covers the full syllabus and targets grades A* to E. Most students aiming for A-Levels, the IB, or university entry take the Extended curriculum.

How Cambridge IGCSE Is Assessed

Assessment is by written exam papers, with some subjects including coursework or oral components. Cambridge International runs major exam series in May/June and October/November, which gives more chances to sit or resit than a single summer window. Edexcel International GCSE runs January and June series (Cambridge IGCSE structure).

Because the syllabus is fixed by the board rather than the school, past papers are a reliable way to prepare. Check the exact subject code for your syllabus, because content and papers differ by code.

Study Strategies That Work

Match your subject choices to your goal

Pick subjects that keep the door open for the route you want next. If you aim at science A-Levels or the IB, take the separate sciences and Extended maths. A focused set that matches your goal beats a scattered one.

Use past papers early and often

The fixed syllabus means papers repeat question styles. Do timed sections from the start so the format feels normal. Working under time pressure shows you which topics are shaky before the real exam.

Build a glossary for each subject

IGCSE rewards precise terms, especially in science and languages. Keep a short list per subject and test yourself weekly. Precise vocabulary is part of the mark scheme, not decoration.

Plan around the two exam series

With October/November as an option, you can sit a subject early or resit without waiting a full year. Map your subjects to the series that fits your school's plan.

How to Read a Syllabus Page

On the Cambridge site, open your subject and find the syllabus code and year. The code decides which papers you sit, so match your past papers to it exactly. The syllabus lists the topics, the assessment objectives, and the weight of each paper.

Read the section on what is not assessed so you do not study beyond the test. Note the coursework or oral requirements early, because they need time. Past papers from the correct code are the closest thing to the real exam, so build them into every week.

Understand the Command Words

IGCSE papers use command words that tell you the depth expected. Mixing them up costs marks even when your facts are right.

• "State" or "List" wants a short, direct answer with no explanation.
• "Describe" wants you to give details about what happens, often in sequence.
• "Explain" wants the reason, not just the event. Saying why, with a link to a principle, is the mark.
• "Compare" wants both similarities and differences, usually in a structured way.
• "Calculate" wants a worked number with units, so show the step even if the answer is obvious.

In my classroom I drill these by taking one past paper question and rewriting it with a different command word, then comparing what each version expects. A student who can turn "describe diffusion" into "explain diffusion" has learned to read the paper, not just the topic.

Common Misconceptions

• Taking too many subjects and spreading thin. A few strong grades beat many weak ones.
• Choosing Core when Extended is needed for your next step. Check the tier early.
• Ignoring the subject code. Papers differ by code, so use the right past papers.
• Skipping coursework or orals. They contribute to the grade in some subjects.
• No timed practice. The paper format rewards familiarity.

What Comes After IGCSE

Most students move to A-Levels, the IB Diploma, or a national curriculum after IGCSE. Strong grades in Extended maths and sciences keep the science and engineering routes open. A broad set of passes keeps more doors open than a narrow set. Universities look at your best grades, not your count, so quality matters more than quantity.

Picking the Right Number of Subjects

More subjects is not always better. Seven to ten strong passes beat twelve weak ones. Think about your next step: if a subject drags your average down, consider dropping it rather than spreading thin. A smaller load you actually master serves you better than a long list you barely pass.

Use the Specimen Papers

Cambridge publishes specimen papers that show the current format. Do one early so there are no surprises. Specimen papers reveal how questions are phrased and how marks are awarded, which is exactly what you want to learn before the real exam.

Frequently Asked Questions

Is Cambridge IGCSE the same as GCSE?

They are treated as equivalent qualifications. UK universities, including the Russell Group, state no preference; they weigh the grade, not the badge.

How many IGCSEs should I take?

Schools commonly enter students for 7 to 10. Quality matters more than quantity, so aim for strong grades.

Which is better, Cambridge or Edexcel IGCSE?

Neither is better in academic terms. Both are accepted widely. The choice usually depends on your school's offering and the subject syllabus you prefer.

Is a C a pass?

In the Cambridge A* to G scale, a C is widely treated as a standard pass. For Edexcel, grade 4 is the standard pass.

Can I resit during the year?

Cambridge offers May/June and October/November series, and Edexcel offers January and June, so yes, within the year in most cases.

How should I prepare for IGCSE science?

Use past papers from the correct syllabus code, build a per subject glossary, and review under timed conditions. The GCSE Biology guide covers similar science content if you want extra practice.